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SG1577DY Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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SG1577DY Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 15 page © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com SG1577 • Rev. 1.0.5 4 Pin Configuration Figure 4. SOP-20 and DIP-20 Pin Configuration (Top View) Pin Definitions Name Pin # Type Description RT 1 Frequency Select Switching frequency programming pin. An external resistor connecting from this pin to GND can program the switching frequency. The switching frequency would be 60kHz when RT is open and become 320kHz when a 30k Ω RT resistor is connected. IN1 2 Feedback Inverting input of the error amplifier. It is normally connected to the switching power supply output through a resistor divider. COMP1 3 Compensation Output of the error amplifier and input to the PWM comparator. It is used for feedback loop compensation. SS1/ENB 4 Soft Start/Enable A 10µA internal current source charging an external capacitor for soft start. Pull down this pin and pin 17 can disable the chip. CLP1 5 Over Current Protection Over-current protection for high-side MOSFET. Connect a resistor from this pin to the high-side supply voltage to program the OCP level. BST1 6 Boost Supply Supply for high-side driver. Connect to the internal bootstrap circuit. DH1 7 High-Side Drive Channel 1, high-side MOSFET gate driver pin. CLN1 8 Switch Node Switch-node connection to inductor. For channel 1 high-side driver’s reference ground. DL1 9 Low-Side Drive Low-side MOSFET gate driver pin. PGND 10 Driver Ground Driver circuit GND supply. Connect to low-side MOSFET GND. VCC 11 Power Supply Supply voltage input. DL2 12 Low-Side Drive Low-side MOSFET gate driver pin. CLN2 13 Switch Node Switch-node connection to inductor. For channel 2, high-side driver’s reference ground. DH2 14 High-Side Drive Channel 2 high-side MOSFET gate driver pin. BST2 15 Boost Supply Supply for high-side driver. Connect to the internal bootstrap circuit. CLP2 16 Over-Current Protection Over-current protection for the high-side MOSFET. Connect a resistor from this pin to the high-side supply voltage to program the OCP level. SS2/ENB 17 Soft-Start/Enable A 10µA internal current source charging an external capacitor for soft start. Pull down this pin and pin 4 can disable the chip. COMP2 18 Compensation Output of the error amplifier and input to the PWM comparator. It is used for feedback-loop compensation. IN2 19 Feedback Inverting input of the error amplifier. It is normally connected to the switching power supply output through a resistor divider. GND 20 Control Ground Control circuit GND supply. |
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